Q. An open carriage in a goods train is moving with a uniform velocity of 10$\ ms^{- 1}$. If the rain adds water with zero velocity at the rate of 5 $kgs^{- 1}$, then the additional force applied by the engine to maintain the same velocity of the train is

A) 0.5 N
B) 2.0 N
C) 50 N
D) 25 N
Explanation

(c) $F = v\frac{dm}{dt} = 10 \times 5$ N = 50 N

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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